Stitch-forming mechanism for sewing-machines.



C. A. DBAR'BORN; STITCH PORMING MECHANISM FOR SEWINGA MACHINES.

APPLICATION FILED AUG.12, 1910.

Patented m8211912.

. 4 anims-SHEET s.

o 7...: i um w c.. A; DEARBORN; STITCH lFo-IUMING MBGHA'NISM PoR SEWING MACHINES.

l I v APPLICATION'IILED AUG.12,'1910.

Patented 1116112731912.

, bij

C. A. DBARBORN. STITCH FORMING MBGHANISM FOR SEWING MACHINES.

` APPLICATION FILED UG.12, 1910. 1,018,885.

4 SHEETS-SHEET 4.

Patented Feb. 2'?, 1912. y

'To all whomz't may concern UNITED sTTs raum ormoni.

CHARLES A. DEARBORN, OF'NEW YORK, N. Y., ASSIGNOR T0 DAVID J'. NEWLAND; '0F

NEW YORK,l N. Y.

STITCH-FORMING MECHANISM FOR SEWING-MACHINES.

.Be it known that I, CHARLES A. Dilata- BORN, a4 citizen of the United States, and a opposite side.

resident of the borough of -Manhattam city, county, and State of New -York, have invented certain new and useful Improvements in Stitch-Forming Mechanism for Sewing-Machines, of which the following is a specification.

The present invention relates to improvetrated in Patent No. 814,025 grantedto me March-6th, 1906.

The stitch forming mechanism of my present invention includes the usual needle arranged to rock' or osc-illate transversely of l lthe line of feed, and a looper of peculiar.

construction both as Ato its form and mode of"coperation`ivith the needle.

The improved looper 'comprises-a looper rod mounted in the machine frame at anv incl-ineto the horizontal planeof feed of' the work andat an incline to the-needlerock-shaft.l The looper proper is offset-from the forwardend of the looper roda-nd' pe'- culiarly from the needle at onefsideofthe line of stitching and carry it across the line of.

stitching and deliver it to the needleA at the The needle and Looper op-` erate-in intersecting plane's'transverse to the line of feed, so that the looperwvilltake a loop from .the inner or'rear face off the needle at one sideof the line of stitching,- andthe needle Will take the loop from thel inner or rear face of the looperat:the opposite sideof the line fof stitches. Unlike thej looper' ofmy above named patent, .-the im- 'Y proved looper of the present invention has a simple oscillating 'motion about its longi- Atudlnal axis, there being no movement of the looper parallel. with the axis of the looper rod. The oscillation of the looper is -pref- 'erably slightly more than. half a circle in For imparting the oscillations to I mount .upon thelooperrod two extent. the looper,

mately at a 'right angle to the axis of the looper rofl The rocking segmental imm@ shaped to'take thefloop of-thread.

Specification of Letters Patent.

ithread into engagement thereivith .Injoider that my inventiongmay iimproved construction of l .rib and the presser foot; Fig. 7 is a detail -1'19' Patented isjdriven by a crank and pitman connection ivolves a novel mechanical movementv which I desire.' to claim. in a broad sense in the present application.

In addition to. the novel movementfof the improved. looper, the stitch' forming mechanism preferably includes a stationary stitch and-,needle guide.v having a pin or projection extending into. thepathfof the loop to engage and spread the .loop upon the looper.

as the point of attachmentofthe loop .with the uwork .is advanced yby-the feed of the Work, to .insure the entranceof the needle into the loop. Said guide is also preferably formed with. a. groove for-determining the .exactl path of the needle..` The looper 'proper is formed with atapered nose which enters the ,loop carried by the needle as the .needle starts its backward movement after penetrating the Work, and a4 shoulder for engaging 4,the loop and carrying it across the line 'of stitches into 'engagement with the .loop spreading projection of.. the stitch andneedle guide. The. loo er lmay be provided .With a. Slotted heeln or 4the, .reception of. the loop spreading'projectionor. it may be so"arranged with relation to said'proj'ec- .tionthat one .of fthe sideffaoeswill vwork over said projection; for throwing loop be fully understood .Il will` .first ydescribe the `same with reference tothe accompanying drawings,jand"afterward. oint out the :novelty more' particularly in t e', annexedl claims. l

Infsaiddrawings Figure 1 is ,l a side 'eleva-Av tionof my improved sewing-machine. Fig. l

2 is. aA planview of lthe same. Fig. 'Slis a front 'elevation of the same.,

are. detail .v ievvs.. illustrating parts of. 'the looper-driving mechanism, F1g.` 6 iS. a detail-'sideelevation"ofone of.. the 4Work s'up.- porting-p longitudinal sectional .view illustrating` the the ridge-forming "view m-illustrati,1,1 g` theadjustable driving con- Figs. 4 and .5

Feb'. 27, 191.2.

upwardly extending arm 2 terminating in nection for the oscillating ridge-forming rib. Fig. 8 is a plan vlew of the parts shown in Fig. 7 Figs. 9 and -10 are detail plan views showing different positions of the looper and needle with'relation to the stationary stitch and needle Guide. Fig. 11 is an end view of the form of looper shown in Figs. 9 and 10. Figs. 112 and 13 are views similar to Figs. 9 and 10 of a modified form of looper.- Fig. 14 is an end view of the form of looper vshown in Figs. 12 and 13.

. The 'main frame of the machine of the type to which myimprovements are particularly applicable is formed of a single casting comprising a rigid central base 1, the

sleeves or shaft bearings, 3,and a forwardly extending arm having bearings for the needle rocker shaft 15 and for the looper and operating mechanism.

1s the,.main driving shaft of the vmachine journaled in the bearings 3 of the rear arm 2 and having secured at one end the driving pulley l1 and Hy wheel 12.

is the forwardly-extending needle rockshaft journaled in the bearings 6 and 7 and having rigidly mounted upon its forward end a needle-carrying rock-arm 16, in which is mounted a curved 'needle 17.

18 is the usual thread-guide and needleclamp mounted upon the rock-arm- 16 by means of theV set-screw 19.

20 and 21 are' ordinary thread-guides Secured to the rear end of the `needle 'rock-shaft 15 is a rock-arm 25, having universal joint connection 26' with a link 27, which encircles an eccentric 28 mounted u on the main power-shaft 10' just inside of) the crank-disk 13. The link 27 and the eccentric 28 are formed with spheroidal enaging surfaces to allow free lateral play of the link in the transmission of the rotary .motion ofthe main shaft 10 into the oscillatory motion of the needle shaft 15. By this needle-,operating mechanism which is the same as in myiprior patents) t e needle is glven a reci rocatory motion in an arcath of the work which' transverse to t e l is passed through t e machine by the mechanismsfnow to be. described.

Projecting up from the Aforward edge of the base 1 is an auxiliary 'arm 30, which is rigidly and adjustably securedto the'base by lmeans of set-screws or boltsl: The auxiliary arm 30 is formed at its upperend with'two sleeves 32 and 33, `'in which is mounted a pivot-shaft34, projecting a little beyond each ofthe sleeves `32 and 33. Setscrews 35 pass through the s1eeves32 and` v33 end .engage the pivot-shaft 34`for`h1ding it rigidly in position.

lV forwardly-eX-tending spring sustained y worksupporting frame This frame.40 hasI the rearwardl. presented 'integral journal sleeves `41,-whc are jouirnaled upon the projecting ends of the pivotshaft 34 and rest snugly against the frame sleeves 32 and 33,v by which the work support 40 isI accurately held in position, Asaid lsupport being 4allowed tov move vertically spring s extended down behind the auxiliary frame Varm 3Q and is engaged4 by a hook 46, formed on the rear-end of the threaded rod47, which passes freely through an opening formed in the arm 30 and is engaged at its forward threaded end by a butter-fly nut 48, by which`the tension of the spring can be increased 0r decreased at will. The work-support 40 is also formed with an integral downwardly project-in arm 41, eX- tending belowr the lefthand caring 41 in position to engage an adjustable stop in the form of a screwv 49, which is threaded through an integral post of the auxiliary arm 30. By adjusting the screw-stop 49 the 'limit of thenormally' raised position cf the work-supporting plateVA 40 under the'action of the 'spring 45 can be 'adjusted to a nicety. The work supporting plate 40 is extended to the left (viewing theV machine from the ffont, as s ho'wn' in Fi 3) into a work supporting horn 'whic is sha ed to receive the ridge-forming disk and tie independently -yielding work-supporting plates,- which will-now be explained.

is the ridge-formingdisk fixed upon a shaft 61 journaled in horizontal position in suitable bearingsupon the horn v55. This disk 60 is preferably formed witha series of forwardly presented inclined cloth-engaging teeth 62for the purpose hereinafter explained. Adjust-ably secured to the shaft 61 1s a rock 'arm 63 carrying at 4its upperend an adjustable crank pin 64. This crank pin 64 is A formed with a spherical, head 65 mounted eccentric-tally with relation, to the axis of .the crank pin. Thiscrank head can 'be adjusted upon its axis in thebearing formed in the ar1n63 to adjust the length of the crank.

66 is a link pivotally connected with the spherical crank head and extending therefrom rearwardly of the machine to a point.

l' 67 where it is pivotally connected with the upper feed arm 133 hereinafter referred to.

Bythis means theV shaft 61 is givena back and forth oscilflatory motion forv oscillating thevdisk 60 in unison with the Aupper feed 'devices hereinafter referred to.

Two independently yielding work, supi '.l`hework support- I ing plates or pla-tens are both of thev same ies4 construction so thata description of one will suffice for both.

i a curvedarm or lever v72 which is journaled y in normal' position.

upon a pin 73 mounted Vupon the -horn 55 of the work supporting 'frame 40. The arm presenting the plate 70-in proper position. A curved arm 72a extends from the bearing hubpf the arm 72 and hasrconnected; with it a spring 74 attached at 7.5'to the horn of the work supporting frame forthe purpose` or" yieldingly'holding the arm .or llever 72 A spring 76 mounted upon a pin 77 projecting-fromone face of lever 72 has one arm in engagement with a nut or collar 7 8 and its other end in engagement with the slotted heel 79a of the plate or platen 70. This spring 76 yieldingly supports the plate or platen 70-in its normalposition upon the arm or lever 72 and allows the plate or platen to -move downwardly at itsl forward end upon its pivot 71. Each plate is formed with an integral lug 70b projecting from it in rearof t-he shaft 61 so as to, engage said shaft and limit the movement of plate or platen 7() upon pin 71 in the opposite direction. It will be observed that each plate or platen 70 .is pivoted at a point near its heel orrrear end to the arm.72 and .that the forwardly projecting portion of each plate or platen is cut-out as shown at 70c to `give freedom .of motion either when the platen is moved upon itspivot or moves with supporting arm 72. From this construction it will be clear that the rear end or heel of each platenwill move downwardly toward arm 72v only in conjunction withthe downward increment of arm 72 under the action of an extra thickness of material.

'is the presser foot, removably secured; by screws 101 to the forward web portion of a yoke 102, which is formed with rearwardly presented lugs 103,' which are pivoted upon setscrews 104:,.mounted in the downwardly projecting lug 105, formed in tegral with the machine arm 5.

lOGis a torsion spring 4secured at one end to lug 105 of' the machine arm and `engaging at its other end the'under surface of the yoke'102. This spring 106 tends to=move the presser foot upwardly and to'support itin normal approximately horizontal `position when the cloth supporting frame is depressed. y v e Mounted lupon the upper facey of the I presser foot 100 is a yoke 115 formed with a central depression which rests in a transverse slot 117 formed in a headed guide pin orstud 116 secured to the machine arm 5 beneath the 'forward bearing for the needle rock shaft. This headedpin or stud 116 confines between its headand the sewing machine arm an expansion spring 118,-the

Each plate or platen is pivotally mounted at 71 on the upper end of lower end of which projects across-theslot 117 and engages the `yoke 115. The sprlng 106Kabove referred to holds the pivotally mounted presserv foot `with its yoke 11e inA ,engagement with the spring 118 and since the spring 118 is stronger than the spring 106., said spring 118 will not be compressed when the vpresser foot is in its normal posltion, but is capable. of beingcompressed to allow a slight `further upward movement of the, presser foot when the presser foot fis subjected to a .greater -upward pressure. The limit of upward movement of the pressery oot`may`be the limit of the compressionV of spring 118 or it 4may be limited by the .depth of t-he slot 117. The spring 118 is of less strength than the'spring 4 5, above referred to lso that when :an unusual thickness of work passes between the presser foot and the work supporting parts upon the supporting frame 40, the presser oot will move upward slightly to permit thev I passage of the excess'of thickness, and'if the permitted upward movement ofthe presser foot vis not sufficient to allow the extra thickness of material to pass beneath it, then the work supporting frame will yield downwardly sulic'ient-ly to allow the pas# sage of thevextra thickness in the work.

The presserfoot 100 is formed`v with the main longitudinal sl'ot 110 through which the ridge of the work is'pressed by the r'work ksupporting plates 70and the ridgedorming disk 60, and in which the upper feed member hereinafter referred to operates. .'The

presser foot 100 is also formed at one side e' of'theslot 11() with va needle guiding groove 111 and in rear of this groove isl an opening 1125- into which the looper is depressed just prior to taking the loop from ther needle. At ,its opposite side, they presser foot 100 is formed with .an opening 11B-alongside of the main longitudinal'slot 110 for the purpose of receiving the lower end of the stitch and needle guide presently lto be explained.

Secured to thev sewing machine armi at, 120 adjacent vto the forward bearing of thev needle rock shaft is the stitch and needleV guide 121. This needle guide has inwardly projecting Hat portion 122 at lits lower endy Vin the upper face of which is formed a trans vverse needle guiding groove 123, which is in alinement with the groove 111 ofthe presser foot. member is also formed with a slot 123* ex- This stitch and needle guiding plate' ytending through it to receive the nose of the i looper, and a short thread-engaging pin 124 projecting into the slot 123, Thestitch and needle guiding member 121 is rigidly sup- 125 ported as explainedso as tombe presented in .aconstant relation to the needle and looper without regard to the varying thick' nesses'in the work and the changing posi-g.y

tionsof. the presserufoon `the slot or opening -113 of the presser foot being of-prope'r size to receive the lower enfl of the stitch and needle guide and thereby permit the move- "prises a two-part feed dog 130, 131, each ment of the presser foot as above explained.

Coperating with the work supporting devices described above, I prefer to employ an upper feeding device of the construction covered by Patent No. 814,026'granted to me March 6th, 1906. This 'feed device com` partof which is formed with two rparallel l rows of serrations-or teeth on its under surfront and in rear of the pathvof'the needle:

.feed dog in operative position.n

face and arranged to engage the work in This two-part feed dog ispreferably formed integral with and projects laterally from a supporting arm 132, which' is secured, by

means of screws, to the forward end of a longitudinally movable rocking arm or bar This arm or .bar 133 is formed be-A 133. tween its ends with an 'elongated slot or opening 134, inclined'slightly from the hori zontal. Atlanti-friction roller 135 is supported upon one of the set screws 104 vfrom the machinev frame lug 105 and engages in the inclined elongated" slot or opening 134 for supporting the arm or bar 13,3, withthe end of bar 133 is formed with a yoke'136, which embraces an eccentric 137, keyed to the main driving shaft 10 of the machine by which the feed mechanism is operated.

' The movementof the feed ,dog under the This eccentric will cause the arm or bar 133 to reciprocate forwardly and backwardlyA land rock slightly upon its pivot roller 135 -to raise andlowerthe feed dog.

The inclined slot134, moving over the anti-friction roller 135 during the rciprocation of arm or bar. 133, serves to counteract the lifting of the dog on its feeding stroke and increasing the lifting action on its return stroke.

action of the eccentric, as modified by the inclined slot and roller support, will be a feeding stroke in a straight line in aliorizontal plane and a return stroke in an arc. The two `.rows of teeth uponthe feed dog 130 and 131 engage thework in slot 110 of the presser foot directly above the `independently yielding work-supporting plates 70A above referred to. y

The work supporting and feeding devices above described are Inot claimed in myrprefsent case butY form lthe subjectmattei of my divisional application Serial No. 598,7 52, filed December 22nd, 1910.

140 isa looper rod journaled in the bearings 141 and 142 projecting from the bearings of the needle rock shaft above referredv to.

These bearings support the looper rod 140 adjacent to the needle rock shaft and inclined 'downwardly and inwardly with relation thereto. At the forward end of the looper rod is theadjustably mounted looper proper which' is formed with shank 145v adapted to be clamped in theend'of the looper rod and The reara crank arm 146 having at its end a foot 147 kextending approximately at a right angle to the crank arm, and approximately perpendicular to the axis of rotation of the looper.

In the form' of looper shown in Figs. 9, 10 and 11, the foot 147 is-formed with a toe 148 beveled or tapered to a sharp edge 'and cut away at one side to provide a thread engaging shoulder 149. In ythis form of looper, t-he end face of thefoot 147 is formed with a deep groove 150 extending in a plane approximately concentric with the axis of the looper rod. This groove 150 in this form of looper is designed to receive the thread en-y gagingv pin 124of the guide 121 above referred towhen the looper is in the act of delivering the loop to the needle.

In theform of looper shown in Figs. 12, 13 and 14, the groovelO is omitted and the. looper therebyA provided with a single tapered toe 151 having a thread engaging shoulder 152. In other respects this modified form of looper is the same as the preferred form Vdescribed in connection with Figs. 9, 10 and 11. In the operation of this modified form of looper, the adjustment ofthe' parts is such: that the edge face 153 of the looper foot will move over the thread engaging pin 12sta of the stationary guide "when the looperdelivers the loop to the needle. 4To properly coperate with this modified form of looper, the thread engaging pin 1.24a isn arranged in a slightly different position as shown in Figs. 12 and 13. The operation of the .loopei` mechanism in forming the stitch will behereinafter explained.

In performing its work, the looper has a simple oscillating or rocking motion about allel with the looper rod 140 and of circular 'cross section. A' driving tape or belt 165' operates upon each ofthe tape wheels or pulleys 160 and is secured at its, end by means cfa keying device illustrated. in Fig. rof the drawings. This keying device comprises the central rod or wire 166 around which the end of the driving tape is Ifolded, and a short section of a split tube 16T confning the end of the tape around said. rod or wire 166. proper size to it'snugly in the undercut slot" 162 `of the 'tape wheels or pulleys. vThe lio The section of split tube is 4of isa ing tape,'said securing '10 cut slots 171 adapted to receive the securing key' attached tothe opposite end of the driv-y Vkey being constructed in connection with Fig.

exactly as 'described These vpulley segments' of theA drawings:

to facilitate their i simultaneously with the movements of the upper feeding device, the under layer of the. work' will be u'ioikedin or fulled in. ln accommodating .the varying thickness of the work passing `between the presser foot and Work supporting devices. the plates or platen's' T0"arez.c:\-pable of yielding either ,upon-their pivots T1 or upon the pivotal supportsof;v levers '72.' c vIn case an unusual thickness in, the `vvorkpasses over the'disk tSO'SO-that additional fspace must be afforded 170 are lformed integral with' a rocking betWeeiLgthedisk randf` the presser foot, the

frame/174 journaled' uponA the 4pin 1T5'extending from the sewing machine arm 5" transversely lof thev axis of the looper roth v the twotsegments being arranged in` parallel vvertical planes extending approximately at Aright angl'e'sto the planes in which thejtape f i Wheels or' pulleys 16() operate. These pulley segments are Aseparated sufficiently to permit. the convenient arrangement ofthe tapes between the vWheels or lpulleys 160` and said pulley segments,v itI being understood that:

vthe ftapesaextend in opposite directions around the vtape Wheels or pulleys so as to;

rbe alternately wound and unvound upon the Wheels or pulleys .underthe action ofthe rocking frame carrying the pulley seg-1 The rocking frame 174'co1nprises hub. journa'ledv as vexplained 'and'-w'ebl portions extending from the hub yand 'supporting the ulley segments'. One loffsaidvvelo portions 1s providedv with a vcrank pin .180 to'vvhicli is jou'rnaledfthe'end. of a! link 181 jo'urnaled at its opposite end upon a crank pin-182 extending from the crank disk 13 keyed to the end ofthe main shaft .'10 of the machine by Which the lpulley segments are oscillated for imparting the oscillating movements lto the looper.

AThe operation of the novel parts of the improved sewing machine ywill be 'under- .stood from thefollowing'explanation The.

' ther vdescribed.

movements' of the needle and the upper feed device are the same as? explained inv my above named patents and need not be fur- The Work to be seived is i inserted as m the former type of my machine lby 'depressing the work plate 4 0 and .placing the vvork beneath the presser foot 100 and abovefther 'ridge-forming disk 60 l, and 1Work supporting platesv or platens 70. The 'Work supportingfplatee() is then allowed to mo'veup into its normal position Whiclfrcausesv the 'disk 60 to press a ridge A pendently 'of Work up into themain longitudinal slot 110 offtheI ,presser'foot, the plates 70 firmly supporting thevvork upon opposite sides'of the"ridge'forming disk and 4yielding inde- 'of earch vother to permit inequalities inilthe'wo'rk to pass beneath the. presser foot `urider the action of the 'l feeding dei vices'LdSincethetoothed ridge-forming disk 6G has ato "and fro motion imparted toitpresents the modified form rof looperg fsprin'glll ,will yi'eu f o'o't '.to.nroveupvv'ard slightly, said upward i'novement of the presser foot not interferingin any way ivith the movements of the stitch forming mechanism.

The needle is 0'uided 1n its movements bv ,engagement with the transverse groove 123 of the guide 121 and .groove 111 of the presser foot. the ridge of Work above the disk 60' and' a loop at the opposite side of the ridge in position for the toe of the looper to enter as the looper starts to rock from .its position on the right of the line'of stitch- The ing back to its position on tlie left. moment of engaging the loop from the needle isv illustrated in Fig. '9 for the pre- .ferred form of looper and in Fig. 12 for The loop is caught upon the toe ofthe looperV and" thrown into 149 or 152 and carried by the looper acrossv the line of stitching. and moved downwardly above the plate122 vto cause the upperthread of the loopto engage pin 124 for spreading the loop prior to the succeeding. penetrating strokeof the needle. As the looper iscarrying the loop across the li'ne of stitching as explained, thefeeding device operates to move thepoint of attachment of the loop ivith lthe work so as to present t-he loop in proper position for the entrance of the needle.

In the form of looper shoivn in Figs. 9, 1() and 11, the loop thread is thrown into engagement with thegpin 124; by reason of the movement of the .looper'over saidpin vvhich projectsinto the groovel() ofthe looper, `c'lurin 1; thisniovenient, Whereas in the modified form of looperv shown in Figs. 12, 13 and 14. the pin 12@` is caused lto engage the loop .thread by reason of the movement of the inner edge o r face'f153 ofthe looper foot over. the pin 1241, v

The mechanism.A produces a chain stitch thel same as in tlle machines of my prior patents. In causingthe looper to rock backand forth upon itslongitudinal axis,'it 1 .yvill be clear that the rotary movement of the crank upon the main shaft 1 0 causes the rocking frame 174to rook vupon itsbearing and this alternately pulls down .upon the two driving engagement with the/shoulder *to permit the presserw The needle passes through tapeswhich operate uponl the tape Wheels or pulleys secured to` the looper rod.

I am aware that it has been proposed to construct av stitch forming mechanism -for sewing'machines with thene'edle and` looper operatingv in intersecting planes transverse to the line of feed `of the Work, but in .the only form of such-mechanism lknown to me, the looper rod has been arranged approximately vertical or slightly inclined from'the vertical with relation toV the :plane of feed. Such an arrangement necessitates some provisionffor an expensive vvlufting movement upon the longitudinal axis f the looper rod to obtain 'sufficient clearance between the looper'and the work in rocking the looper` from'one side of the line of stitches to the other. In my yimproved stitch forming mechanism, the inclination of the looper rod to the horizontal plane of feed 4affords the proper clearance between the looper and the Work Without the necessity of a longitudinal movement of the looper upon its rocking axis. I am able to produce With my invention a very simple and effective looper' movement for producing a single chain stitch I claim 1. In a sewing machine, the combination of suitable Work supporting andfeeding devices, andsuitable stitch formingl mecha.- nism, with a stationary thread and needle guide formed with a needle guiding groove and a thread, engaging Ipin.

2. In a' sewing machine, the combination of suitable Work supporting devices, and Work feeding devices, with` a needle operh ating transversely of the line of feed, a looper mounted upon an axis inclined to the plane of feed and oscillating in a plane .inclined to the plane of movement of the needle,.and a thread, engaging pin mounted l transversely of and adjacent to the paths of the needle and looper, whereby the looper will take theloop from the needle at one side of the line of stitches and carry it to the other -side of the line of stitches into engagement With said thread engaging pin to spread the loop for the entrance of thel needle. A,

' 3. In a sewin machine, the combination of suitable Wor` supportmg devlces, and

" Work feeding devices, with a needle operating transversely of thelineof feed, a looper oscillating in a planeinclined to the plane of movement of theneedle, and a thread engagto t e paths of the needle and looper, said looper lbeing formed with a slot extending concentric with t-he `axis of movement -of the looper and adapted to receive said threadv ing pin mounted transversely of and adjacent.

loop for the entrance of the needle.' 4. In a sewin machine, the combination of suitable wor supporting devices, suitableJ feeding devices,and a needleoperating with said thread engaging pin to spread the transversely of t-he line of feed, with a looper mounted to oscillate in a'plane transverse to the line of stitches upon anaxis in- .clined to the plane of feed and the plane of movement ofthe needle, said looper includi ing an arm extending eccentrically with relation to its axis of-movement' and having a loop-engaging foot extending approxivmately a'tright angles to 'said arm and formed with a slot concentric with the raxis of movement, and a loop spreading pin mounted transversely of and adjacent to the paths -of the needle and 4looper and adapted to enter the slot of said looper foot.

In a sewing machine, the combination of suitable feed mechanism, and a needle andI operating mechanism, with a looper, an oscillating looper rodcarrying the looper, aj

rocking frame mounted 'upon an axisv eztl tending transversely of the axis of the looper rod, and flexible connections attached to thelooper rod and rocking frame, said flexible connections extending from opposite sides of the axis of the rocking frame and Winding oppositel upon the looper rod. 6. In a sewlng mac ine, the combination of suitable feeding mechanism, and a needle, y `with a looper coperating with the needle,

a looper rod upon4 which Vthe looper is mounted, pulleys securedl to the looper rod, a rocking frame mounted upon an axisextending transversely of the axis of the looper rod, means for rocking said frame, and flexible driving connections secured at their oppositev ends to the rocking frame and pulleys. i y

7. In a sewing machine,'the combination of suitable feeding mechanism, and a needle, with a looper coperating with the needle, a looper rod upon which the looper is mounted,-pulleys secured to the looper rod, and a rocking frame having opposltely arranged pulley segments, a bearing for said rocking frame extending transversely" of the axis of said looplerrod, means -for rocking said frame, and flexible driving connections connectedat their oppositeends-'With the y ber, a looper coperating with said needle,.a

looper rod mounted longitudinall `in said frame inclined to the plane of fee pulleys secured to said looper rod, a rocking framey having pulley segments, `a bearing pin for said rocking frame mounted in the machine frame transversely of the axis of said looper rod, a crank and pitman connectionbetween said main shaft and said rocking frame, and flexible bands connectedl at their opposite ends with said pulley segments and looper rod pulleys.

9. In a sewngkmachine, the combination of suitable feeding mechanism, and a needle, with a looper coperating 'with the needle, a lcoper rod upon which the looper is mounted, pulleys secured to the looper rod'and formed with undercut slots in their ,peripheries, and a 'rocking fra-ine having oppo- 'I sitely arranged pulley segment-s formed With undercut slots. intheir peripheries,

. means for rocking said'frame, flexible driving tapes or bands, and keying devices securing the ends of said tapes or bands in said undercut slots of said pulleys and pulley segments.

l0 In a sewing machine, the combination' of suitable feeding mechanism, and aineedle,

With alooper coperating with the needle, a

looper rod upon which the looper is mount-- ed, pulleys secured to lthe looperrod and formed with undercut slots in their peripheries, and a rocking `frame, having oppo- V'site1yarrangedl pulley segments. formed with undercut slots in their peripheries, means for rocking said frame,-flexible drivingvtapes or bands, andkeying devices comprising split tuloes and rods secured upon the ends of said tapes or bands andltt-lng 'Copies of lthis patent may be obtained for've cents-each, by addressing the ""Commissioiler of Patents,

Washington, D. c. f 

